congrats and just relax. face-face or telephone depends on where you are. Sometimes they conduct video conference sort of interview in British ambassy. good luck!
guess OX equally has a lot of B&Bs around the place. Not so familiar with the place.It is just in front of the railway station and thus is very convenient to go by train. I do not like the coach system, seems to be cheaper yet you may get stuck 3-4 hours on the way. Safer with the train. Good luck for your interviews.
I just finished interview in Cambridge and will move to Oxford tomorrow afternoon. My interview in Oxford is scheduled on 17 June. Hope to meet you guys in school before my interview.